n. A mark (÷) used to represent division in mathematics. Also used to indicate a written or printed passage, and in ancient manuscripts to mark a word or passage as spurious or doubtful.
n. A dagger mark (†) used as a reference mark in printed matter, or to indicate that a person is deceased, often used to indicate a footnote.
the GNU version of the Collaborative International Dictionary of English
n. A mark [thus —, or ÷]; -- so called as resembling a needle. In old MSS. or editions of the classics, it marks suspected passages or readings.
The Century Dictionary and Cyclopedia
n. A mark, so called from its resemblance to a spit, usually made like a dash, thus —, or like an obelisk, thus , and employed in ancient manuscripts to indicate a suspected passage or reading.
Word Usage
"In the Latin text, the start and end of passages which are deeply corrupt and therefore difficult to correct are indicated by an asterisk, instead of the usual dagger (obelus)."